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Chevron Products Company 4 <br /> Chevron Terrtvnal 1001621,22888 Kasson Road,Banta CA February 28,2002 <br /> 24A and MW-28A exhibited some decrease in TPHd concentrations All wells except for <br /> MW-29A exhibited some decrease in MtBE concentrations <br /> Test wells TW-1 through TW-4 operated intermittently during this period Nearby wells in <br /> the area had measured dissolved oxygen levels from 5 38 mg/1 to 7 82 mg/l, however, UA- <br /> zone wells generally contained separate-phase hydrocarbons and had lower dissolved oxygen <br /> UPCOMING ACTIVITIES <br /> During the upconung reporting period, the following activities will be performed <br /> • Perform comprehensive inspection and troubleshooting of the intermittent ISO-GEN <br /> units TW-1 through TW-4 Each unit will be reactivated following troubleshooting and <br /> resolution of any operational problems <br /> • Conduct groundwater quality sampling each month for the duration of the ISO-GEN pilot <br /> study and analyze samples In accordance with the existing analytical schedule <br /> • Prepare a monthly status report for the next reporting period <br /> ISO-GEN system operation is scheduled to continue through March 2002 If you have any <br /> question regarding this status report, please contact Bob Jackson at (916) 861-0400 extension <br /> 283 or Scott Gable at extension 231 <br /> Sincerely, <br /> SECOR International Incorporated <br /> Bob W Jackson Jr <br /> Staff Geologist <br /> Scott Gable, RG 6366 <br /> Principal Geologist <br /> I IChevron110016211Penodic Momtormg\ISO-GEN MonthlyVan 02 I80GEN status report doc <br />